SINGAPORE - She had lured the teenage girl with the promise of a job, only for her brother to force the 17-year-old Chinese girl into prostitution.
The brother, Chinese national Tang Huisheng, 37, who acted as the girl's pimp here, was arrested in June.
He has claimed trial to seven charges relating to the prostitution of an underage girl and is due to appear in court on Friday.
During the sentencing of two more men who had commercial sex with the girl, District Judge Hamidah Ibrahim asked prosecutors if Tang's sister, Ms Tang Huiying, had been dealt with.
She was told Ms Tang had not entered Singapore and so could not be charged here.
A total of 24 men, comprising 15 Singaporeans, eight Chinese nationals and a Malaysian working here, have been charged with having paid sex with a girl below the age of 18.
With yesterday's sentencing of Wu Delong, 35, and Yang Dong, 37, to 11 weeks' jail each, 13 men have been convicted so far.
The two drivers from China had pleaded guilty to one count each of paying for sex with the girl.
They had seen the girl soliciting for customers at the junction of Geylang Lorong 22 and Geylang Road and separately hired her and had sex with her at the nearby Min Wah Hotel.
When the men asked for her age, the girl said she was 19.